Clicking on the transition between animations doesn't deselect Animator layer. This will cause an issue when deleting transition in this way. Instead of transition entire layer will be deleted.

Steps to reproduce:
1. Download 996153_repro.zip
2. Double click Animator to open Animator window
3. Select base Layer
4. Select transition between animation "1" and animation "2"
5. Notice Animation layer still selected

Expected results: Animator Layer isn't selected after selecting transition between animations
Actual results: Animator Layer is still selected after selecting transition between animations.

Note: Also reproducible when box selecting multiple components.

Reproduced with: 2018.1.0b6, 2017.3.1f1, 2017.3.0a3
Not reproducible with: 2017.2.1p3, 2017.1.3a2
Regression introduced in: 2017.3.0a3